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Biodiesel Flow Meter DN200 Bulk Transport Custody Transfer Specs
Quick Answer
For biodiesel bulk transport custody transfer with DN200 pipelines, you need a Coriolis mass flow meter with custody transfer certification. Silver Instruments supplies a DN200 Coriolis meter that measures mass flow directly in kg/h or t/h, independent of density changes from B100 to B20 blends. It outputs 4-20 mA HART and pulse, meets OIML R117 or MID MI-005 standards, and operates safely in ATEX Zone 1 environments common at biodiesel loading terminals.
Why DN200 Size Is Common for Biodiesel Truck and Ship Loading
Here is the thing. Biodiesel plants in Thailand, Malaysia, and Indonesia often load road tankers and small bunker barges through 8-inch pipes. A DN200 meter handles flow rates from 40 m³/h up to 600 m³/h without high pressure drop. In practice, a 40-tonne tanker fills in under 20 minutes at 200 m³/h. That is exactly where a full-bore Coriolis meter works best because it avoids moving parts and handles viscosity up to 50 cP without recalibration. Most engineers skip ultrasonic doppler types here because biodiesel can have trace glycerin that scatters signals. Coriolis gives repeatability better than 0.05% and custody transfer accuracy of 0.1%.
Recommended Meter: Silver Instruments SIL-CMF200 Coriolis Mass Flow Meter
We configure the SIL-CMF200 with 316L stainless steel wetted parts and PTFE or FFKM seals compatible with fatty acid methyl esters. The primary output is a scalable pulse for custody transfer and a 4-20 mA HART loop for DCS or flow computer integration. A built-in PT100 sensor provides process temperature and density. In our standard build, the meter comes with EN 1092-1 PN16 flanges, 200 mm inner diameter, and secondary pressure containment rated to 100 bar. Because biodiesel loading terminals are often outdoor and unheated, we include a remote transmitter so you can mount the display panel near the operator and the sensor in the loading skid. The meter uses M12 and cable gland connections rated IP67. For hazardous area, we deliver ATEX Zone 1 Ex d ia IIC T4 certification.
Key Specs You Must Confirm Before Quotation
A custody transfer system is not off-the-shelf. Here is what you need to define. Pipe schedule: your DN200 pipe might be Sch 10S or Sch 40. Flow range: typical is 100 to 500 m³/h, but we need your minimum, normal, and maximum flow. Fluid properties: B100 density at 15 °C is about 0.88 kg/L, viscosity 4 to 6 cSt. If you blend B20, viscosity drops. Ambient conditions: in the Middle East, sun radiation pushes surface temperature above 60 °C, so we specify a max ambient of 70 °C for the transmitter. Power supply: 24 V DC loop or 85-265 V AC for remote version. Output protocol: pulse scaling for batch controllers like Contrec or Omni, Modbus RTU on request. Send us your pressure (bar), temperature (°C), pipe size (DN), and flow range. That way we can return a datasheet with pressure drop, accuracy curve, and price in two working days.
Real Site Story: Indonesia B100 Loading Arm
A biodiesel producer in East Kalimantan approached us last year. They loaded B100 to ISO tank containers at a jetty. Their old metering system used a positive
Installation Note for DN200 Coriolis
Most engineers skip this part. DN200 Coriolis meters are heavy, around 280 kg. You need proper pipe supports on both sides. No straight run required, which is a big advantage over ultrasonic and turbine meters. However, ensure zero point adjustment after installation and perform a water calibration or air check. We always recommend a strainer upstream because some loading terminals still use rubber hoses that shed particles. Also, if you use a prover for periodic calibration, a bidirectional ball prover is common. We can provide pulse outputs with phase shift for prover interfaces.
FAQ: Biodiesel Custody Transfer Flow Meter
Q: Can I use a turbine flow meter for biodiesel custody transfer?
A: Some terminals still use turbine meters, but biodiesel tends to form deposits on rotor blades. That shifts K-factor. Coriolis mass meters need no K-factor adjustment because they measure mass directly. For custody transfer, Coriolis is preferred under OIML R117.
Q: Does Silver Instruments hold OIML / MID certifications?
A: Yes, our SIL-CMF series has OIML R117-1 pattern approval for accuracy class 0.3 and 0.2. We provide declaration of conformity for MID MI-005 when required. Indicate your target certification body (e.g., SIRIM Malaysia, BSN Indonesia) so we include the right documentation.
Q: What is the maximum viscosity range for the DN200 Coriolis meter?
A: Standard calibration covers 0.5 to 50 cP. Biodiesel is thin, but we can calibrate for higher if you also meter residual glycerin. The meter accuracy stays within 0.1% over the full viscosity range without adjustment.
Q: How do you handle air pockets during loading?
A: The meter has an integral densitometer. If air entrainment drives density below 0.8 kg/L, the transmitter triggers an alarm. We also supply an optional air eliminator for bulk loading skids. In our experience, a simple back pressure valve on the downstream keeps the meter full.
Q: Can you integrate the meter into a loading skid with batch controller?
A: We do not supply the complete skid, but we pre-configure pulse scaling for common batch controllers such as Contrec 1010 or OMNI 4000. We test the output with your defined flow computer parameters before shipment. Specify the controller model and we ship a ready-to-connect pulse cable.
Send us your pressure (bar), temperature (°C), pipe size (DN), and flow range. Email your parameters to [email protected] or visit https://flow-meter.com.au. We reply with a technical proposal including pressure drop chart, accuracy curve, and price within 48 hours.